anyone know what this hitchhiker is? good or bad?

[sinful]

I noticed this yesterday, it seems to disappear at night and only come back during the day.

 

[brandon429]

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I bet it is a juvenile rock anemone. Hard tell from that distance, let's get a macro of it. Rock anemone 75%.

 

[Brian5280]

It doesn't look like anything bad. Leave it if you like it, take it out if it bothers you.